540 



PHYSICAL GEOGRAPHY. 



cinnamon, and coniferous trees, with a warm temperate climate. The 

 same must have abounded in New Hampshire. 



At the close of the Tertiary period, ice began to accumulate, and there 

 was ushered in an immensely long period when the state was covered 

 with glaciers, and the climate corresponded with the present state of 

 things in Greenland. I have no time to enter fully into the history of 

 this period. In general, four periods are represented, — first, when the 

 state was entirely covered with glacial ice thousands of feet in thickness 

 and moving in a southerly direction ; second, when local glaciers were 

 prevalent; third, the ChamjDlain or terrace; fourth, the historic period. 

 Our map is designed to illustrate the movements of the ice during the 

 first of these periods. 



Fig. 63. — WHITE MOUNTAIN RANGE, FROM JEFFERSON HILL. 



Four special features of ice-motion are suggested by studying the 

 scorings upon the ledges .-—First, the greatest amount of work seems to 

 have been accomplished by the south-easterly direction of the sliding. 

 This course prevails over th^ whole of Coos county, the White Moun- 

 tains, and the higher peaks along the Connecticut-Merrimack water- 

 sheds. The highest markings preserved stand at 5200 feet above the 

 sea; but transported pebbles have been picked up 600 feet higher, on the 

 north slope of Mt. Washington. This summit seems to be the only part 

 of the state that has not been subjected to glacial action. 



